I am puzzled by the behavior of PiecewiseExpand. In its simplest version,
my question is this:
In 1: PiecewiseExpand[UnitStep[x]]
Out 1: 1 x >= 0
Are we to assume from "Out 1" that UnitStep[x] for x < 0 is zero?
And note the following:
In 1: PiecewiseExpand[UnitStep[x],x < 0]
Out 2: 0
By the way, PiecewiseExpand[UnitStep[x], -1 < x < 1] returns the
same value as "Out 1".
Jack